Description:Cosmological probes have a lot to tell us about the nature of the Dark Matter in our Universe. In this talk, I would like to review in particular how CMB temperature and polarization anisotropies can be used to look for exotic electromagnetic energy injection, coming for instance from decaying particles. I will then develop the recent searches for low masses - evaporating - primordial Black Holes, as well as high masses - accreting - ones. Finally, I will emphasize the synergy with CMB spectral distortions and Big Bang Nucleosynthesis studies and illustrate how the 21cm signal, one of the main target of future experiments, could be used in order to improve (but not always!) over current sensitivity. (11:00 AM, 726 Broadway, 940, CCPP Seminar)